For the non-geek in the audience, this means you can now control your Mac without any sort of third-party software - the phone acts as your mouse and (selected bits of) your keyboard, mapping the phone keyboard to predefined keys according to a HID profile (SonyEricsson bundles three predefined profiles with their new phones - Desktop, Presenter and MediaPlayer, if I recall correctly, all with Windows key bindings).

The übergeek in the audience are free to pore over my notes on HID profiles and try to hack their own - later on, I'll be trying to get the Command keycode straight and creating a SizzlingKeys profile to control iTunes. Watch this space.